RE: [v4 08/16] KVM: kvm-vfio: User API for IRQ forwarding

[Wu, Feng]

> -----Original Message-----
> From: Joerg Roedel [mailto:joro@xxxxxxxxxx]
> Sent: Monday, June 29, 2015 5:23 PM
> To: Wu, Feng
> Cc: Alex Williamson; Eric Auger; Avi Kivity; kvm@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; pbonzini@xxxxxxxxxx; mtosatti@xxxxxxxxxx
> Subject: Re: [v4 08/16] KVM: kvm-vfio: User API for IRQ forwarding
> 
> On Mon, Jun 29, 2015 at 09:14:54AM +0000, Wu, Feng wrote:
> > Do you mean updating the hardware IRTEs for all the entries in the irq
> > routing table, no matter whether it is the updated one?
> 
> Right, that's what I mean. It seems wrong to me to work around the API
> interface by creating a diff between the old and the new routing table.

Yes the original usage model here doesn't care about the diff between
the old and new, it is a little intrusive to add the comparison code here.

> It is much simpler (and easier to maintain) to just update the IRTE
> and PI structures for all IRQs in the routing table, especially since
> this is not a hot-path.

Agree.

Thanks,
Feng

> 
> 
> 	Joerg

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